Elbow exhaust muffler



June 29, 1954 v c, opK s 2,682,312

ELBOW EXHAUST MUFFLER Fill/ ed Nov. :50, 1949 INVENTOR CLARENCE N.HOPKINS lax/2% ATTORNEY Patented June 29 1954 .UNITED STATES iATENTOFFICE ELBOW EXHAUST MUFFLER Clarence N. Hopkins, Portland, oreg'.

Application November 30, 1949, Serial No. 130,155

3 Claims.

I This invention relates to mufiiers and is particularly adapted fordissipating noise developed by the exhaust of internal combustionengines and the like.

The primary object of my invention is the construction of elbows to beplaced in exhaust lines of internal combustion engines that will permitthe expansion of exhaust gases, thereby dissipating heat and reducingthe exhaust noises.

A further object of my invention is to exhaust the gases within theexhaust pipes by way of my new and improved elbows dissipating heatwithout creating back pressure.

A still further object of my invention is the designing of heatdissipators in the form of elbows that will take the place of standardelbows in exhaust lines as commonly used today, particularly on largetrucks.

Another object of my invention is to construct heat dissipators withinthe exhaust pipe that are light of weight and of a material that willreadily conduct heat, means being provided within the unit forincreasing the area exposed to the outside atmosphere assisting in thedissipation of heat.

These and other incidental objects will be apparent in the drawings,specification and claims.

Referring to the drawings:

Figure 1 is a side view of one of my new and improved exhaust elbowmufilers, partially broken away for convenience of illustration.

Figure 2 is an end view of Figure 1, looking in the direction indicatedon line 22.

Figure 3 is a sectional view taken on line 3-3 of Figure l of themufiler looking in the direction indicated.

Figure 4 illustrates a conventional hook up of a series of my elbowmufflers within the exhaust line of a conventional truck, the truckbeing shown in broken lines, part of the exhaust pipe being broken away.

Referring more specifically tothe drawings:

My new and improved exhaust muffler is formed in approximately the shapeof a conventional elbow and is indicated by numeral I. The outsideperiphery of the elbow is enlarged as indicated at 2 and corrugated asindicated by the corrugations 3 formed in the material making up themuffler. This is best illustrated in Figure 1.

When the mufller is enlarged as at 2, it provides a relatively largeexpansion chamber 4 for the gases passing through the exhaust pipe line5 and the stock or tail piece 6. Located within the elbow is a baffleplate 1, running parallel to 2 the flow of exhaust gases and havingopenings or holes 8 therethrough.

The exhaust gases follow this baffie plate around through the elbow, buta certain portion of the gases or over-pressures are allowed to passthrough theopenings 8 into the expansion chamber 4, where the pressureswithin the exhaust line is reduced, permitting the temperature of thegases to be lowered. This lowering of temperature is further assisted bythe corrugations 3 formed in the elbow exposing the gases within thechamber 4 to a considerably larger area of radiation to the outsideatmospheric air, further dissipating the heat within the exhaust line. Ido not wish tobe limited to placing the baffle plate 1 within the elbow,as I have found in many cases satisfactory operation is obtained withoutthe baffle.

It is a well known fact that if the pressure is reduced within the lineheat will be dissipated and if heat is dissipated when the gases enterthe outside atmosphere, noises will be reduced to a minimum.

Referring to Figure 4, it is a simple matter to install my mufllerwithin the exhaust pipe 5 lead- 7 ing from the motor not here shown,there being one or more elbow mufilers illustrated at 9, one at 10 andanother at H, having preferably a flexible connection [2 connected tothe tail pipe 6.

In the average truck, elbows of the common type are used in theseplaces, and by simply substituting my exhaust elbow muflier in place ofthe regular elbows they serve the same purpose in carrying out theexhaust pipe line, but at the same time they reduce the exhaust noises.

Although certain specific embodiments of the invention have been shownand described, it is obvious that many modifications thereof arepossible. The invention, therefore, is not to be restricted except in sofar as is necessitated by the prior art and by the spirit of theappended claims.

What I claim is:

1. An exhaust mufiler comprising an elbowshaped casing for insertion inan exhaust line, the ends of said elbow being of uniform diameter forcoupling with exhaust pipes, the inner and side surfaces of said elbowbeing longitudinally curved to radii of a substantially common centerand transversely curved to a substantially uniform radius with saidends, and the outer surface of said elbow bein enlarged beyond thecurvature that is uniform with said inner and side surfaces to providean expansion area, the wall of the expansion chamber being transverselycorrugated, the corrugations terminating and merging into the curvedsurface of the inner portion of the elbow.

2. An exhaust muflier comprising an elbowshaped casing for insertion inan exhaust line, the ends of said elbow being of uniform diameter forcoupling with exhaust pipes, the inner and side surfaces of said elbowbeing longitudinally curved to radii of a substantially common centerand transversely curved to a substantially uniform radius with saidends, the outer surface of said elbow bein enlarged beyond the curvaturethat is uniform with said inner and side surfaces to provide anexpansion area, said outer surface being transversely corrugated, and aperforated baffle fixed within said elbow on the curvature that isuniform with said inner and side surfaces and cooperative therewith todefine a passage through said elbow of substantially uniform diameterwith said ends.

3. An exhaust mufiier comprising an elbowshaped casing for insertion inan exhaust line, the inlet and outlet ends of said elbow being ofuniform diameter for coupling with exhaust pipes, the inner and sidesurfaces of said elbow being longitudinally curved to radii of asubstantially common center and transversely curved to a substantiallyuniform radius with said ends, and the outer surface of said elbow beingenlarged beyond the curvature that is uniform with said inner and sidesurfaces to provide an ex pansion area, the elbow on the outer surfacehavin a central rib extending from the inlet to the outlet openings ofsaid elbow, and transverse corrugations on the outer surface, thecorrugations extending from the rib terminating and merging into theinner curved surface which is uniform with said inner and side surfaceof the elbow.

References Cited in the file of this patent UNITED STATES PATENTS NumberName Date 1,098,259 Patten Mar. 3, 1914 1,215,451 White Feb. 13, 19171,432,797 Skeels Oct. 24, 1922 1,827,727 Blizard Oct. 20, 1931 1,909,394Dodge May 16, 1933 2,078,754 Day Apr. 27, 1937 2,141,797 Minella Dec.27, 1938 2,417,250 Harvey Mar. 11, 1947 2,484,826 Harley Oct. 18,19482,512,823 Blundell June 27, 1950 2,566,975 Beranek Sept. 4, 195-1FOREIGN PATENTS Number Country Date 387,935 Germany Jan. 9, 19 24 99,710Switzerland June 16, 1923 151,394 Great Britain Sept. 23, 1920

